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While snooping around the 351’s power supply I noticed that one of the rectifiers-the components responsible for converting AC voltage to DC for supply to the tubes-was an old selenium type. Recognizing the age of the components, I expected that some of them would be out-of-spec, which could result in less-than-optimal audio performance and (more importantly) out-of-range voltages in the power supply. It was pretty easy to find schematics, an owner’s manual, and informative threads regarding repair and maintenance of these old beasties on the web. Replacing the tubes was definitely on the menu, given the service dates marked on the rear panel, and I thought it would be a smart idea to verify that voltages to the various parts of the circuitry were correct. pt.At the close of the first episode of “Resurrecting an Audio Dinosaur,” my lovely Ampex 351 tape machine channel was alive and working-though I wasn’t sure if it was working properly, or what I’d need to do to make sure it wouldn’t blow up in my face. Can I do it justice? Nordmende Super 250-9 rest. #tuberadios #radiorestoration I got this one as a gift. Hope this helps you, but remember that high voltages are dangerous! His video is here, and I highly recommend you see it. I decided to try and test it, following the method that TRX Bench presented in a similar video. In my current project, I suspected an EL41 output tube to be faulty, but unfortunately did not have any others on hand. I normally just keep a few (known working) tubes on hand, and swap one in if I suspect a tube has failed. I believe they are too bulky and expensive for my limited needs. Is this EL41 any good? Electronics Old and New by M Caldeira | In my hobby restoring tube radios, I have so far resisted getting a tube tester. #Replacing a selenium rectifier with a silicon diode how toHow to test a tube without a Tube Tester. My goal for this stage of the process was to get the audio section restored and tested, and that is what is covered in this video. So, onwards as per my usual modus operandi: First the power supply, then the audio section. I was afraid the problem may have been the output tube, an EL41, which I had no replacement for, but fortunately that was not the case. 2 Electronics Old and New by M Caldeira | As was obvious from the first video, the audio level on this Nordmende Super 250-9 was disappointingly low. See also playlists on some other completed restoration projects. HowTo's: Various videos on some simple techniques and projects: #Replacing a selenium rectifier with a silicon diode seriesRESTORATION BUILDING BLOCKS: A series of videos showing detailed steps used the restoration process of tube equipment: _HUNDREDS OF OTHER VIDEOS TO CHOOSE FROM_ #tuberadios #antiqueradio #radiorestoration I got lucky, as I was testing this radio with the Dimbuld Tester in use, so it was a good reminder that you should not become complacent.Īnyway, it gets a little more exciting, so I won't complain. With tube radios, the results can be dangerous, or, as was the case here, you could blow things up. When you get quite experienced in this hobby, you can become a little careless. 3 #PCBWay# Electronics Old and New by M Caldeira | Only $5 for 10 PCBs and every new member get $5 bonus. This Dimwit was really saved by the Dimbulb Tester. You can also watch how I re-stuff the electrolytic filter capacitors of this radio here:Įnjoy, and comment if you so desire. ![]() ![]() This radio is the object of a series of videos on its restoration, which you can see here: I take you through my way of 're-stuffing' a selenium rectifier on a SABA Freiburg W2 with 4 silicon diodes. ![]() ©2022 Home About Privacy Replace Selenium rectifier with silicon diodes Electronics Old and New by M Caldeira | Tube radios from the 50s often have selenium rectifiers in the power supply, which may need to be replaced, preferably with a silicon diode bridge. ![]()
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